Which of the following statements is INCORRECT regarding a first-degree AV block?

Question

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First-degree AV block may be a normal finding in individuals with no history of cardiac disease, especially in athletes. First-degree AV block may also occur because of ischemia or injury to the AV node or junction, medication therapy (such as quinidine, procainamide, beta-blockers, calcium channel blockers, digitalis, and amiodarone), rheumatic heart disease, hyperkalemia, acute MI (often an inferior wall MI), or increased vagal tone. The patient with a first-degree AV block is often asymptomatic; however, marked first-degree AV block can lead to symptoms even in the absence of higher degrees of AV block. First-degree AV block that occurs with acute MI should be monitored closely.

Which of the Following Statements Is INCORRECT Regarding a First-Degree